<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .trigle {
            width: 0;
            border-top: 10px solid #142;
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
            /* border-bottom: 10px solid #662233; */
        }
    </style>
</head>

<body>
    <div class="trigle"></div>
</body>

</html>